On the ergodicity of supercooled molecular glass-forming liquids at the dynamical arrest: the o-terphenyl case (Articolo in rivista)

Type
Label
  • On the ergodicity of supercooled molecular glass-forming liquids at the dynamical arrest: the o-terphenyl case (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/srep03747 (literal)
Alternative label
  • Mallamace, Francesco; Corsaro, Carmelo; Leone, Nancy; Villari, Valentina; Micali, Norberto; Chen, Sow-Hsin (2014)
    On the ergodicity of supercooled molecular glass-forming liquids at the dynamical arrest: the o-terphenyl case
    in Scientific reports (Nature Publishing Group)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Mallamace, Francesco; Corsaro, Carmelo; Leone, Nancy; Villari, Valentina; Micali, Norberto; Chen, Sow-Hsin (literal)
Pagina inizio
  • n. 3447 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 4 (literal)
Rivista
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  • 8 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-IPCF Istituto per I Processi Chimico-Fisici University of Messina; Massachusetts Institute of Technology (MIT) (literal)
Titolo
  • On the ergodicity of supercooled molecular glass-forming liquids at the dynamical arrest: the o-terphenyl case (literal)
Abstract
  • The dynamics of supercooled ortho-terphenyl has been studied using photon-correlation spectroscopy (PCS) in the depolarized scattering geometry. The obtained relaxation curves are analyzed according to the mode-coupling theory (MCT) for supercooled liquids. The main results are: i) the observation of the secondary Johari-Goldstein relaxation (beta) that has its onset just at the dynamical crossover temperature TB (T-M > T-B > T-g); ii) the confirmation, of the suggestion of a recent statistical mechanical study, that such a molecular system remains ergodic also below the calorimetric glass-transition temperature T-g. Our experimental data give evidence that the time scales of the primary (alpha) and this secondary relaxations are correlated. Finally a comparison with recent PCS experiments in a colloidal system confirms the primary role of the dynamical crossover in the physics of the dynamical arrest. (literal)
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